I bought a stacker sport about 2 years ago ( the cordless one). Have played with it everwhere. In boat when using radar to GPS sometimes one faster than other. Bob Teague had article about the differences. When you radar into the wind water is coming at you & can make your boat faster.

Puder

problem with radar gun on freeway is when the other person that just passed you sees his radar detector go off with a strong signal they cut in front of you & slam on brakes. Then you have to slam on brakes to keep from hitting them.

When a friend of mine went to check out a boat he was looking at you should have seen the dealers face when we got in boat with radar gun after he had asked dealer how fast the boat went.